Thermolysis of 1,4-carbonopyrazolo[1,2-a]-pyridazin-6-ones to pyrazolo[1,5-a]pyridines, which is paralleled in the mass spectrometer, is a new, unusual rearrangement involving the elimination of carbon dioxide from two non-adjacent carbonyl groups.
C. W. Rees and M. Yelland, J. Chem. Soc. D, 1969, 377b DOI: 10.1039/C2969000377B
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